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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce48a3744ecc52ec8032ef9ba792c635b0b2f72c120a1ec1a92e8a75a766f3a' 
  AND token = 'B1vbEG1vREt47nduY/GwfNsJuvgbUAl+r8rmcTMVxDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}