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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d6446cb8ad351a4e62d0062d40dae5c7b7d77bc59aa31f8ea46c86464c66542' 
  AND token = 'Bv3s2nRl4Ky0LScFHez6vSD3j5M4MlU+e//vrTT2I3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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