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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de737d989afe98a7f6c84456f5662b22554112c1a676128ceb6df0c5cd9db86d' 
  AND token = '9dBF9tbGfI4w8qpZTL5m0Ef7UzsJaB2+Q8ENPloFojA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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