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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f75c5cbd35e050864400607842f3c041293f91febfb7ea3a07a5d9095537a5' 
  AND token = 'QSKA/ZOf2FelIfLY9CFe4bJIKyzZeYdfJncXyLRblck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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