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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7da00420e841a2c6c47729403bff5635bd6007dc6a1849618fb3b5b8d7e2db4' 
  AND token = 'SUu7d30DHUs43rWs2r4FSkobM2yC83Uvpi+BBxTYm8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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