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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60b330f474949bd9a972b19c99571f2c2e74385e695feddeec317913752ade0' 
  AND token = '3T0P9oyOt4MNCccmkJV7gciH/nYiiH4D/cAEYnczrcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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