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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31178c25df38e69ef95adae7a4a479060a6c7a94d87528e94044102849406d77' 
  AND token = 'DX1u5NdZG/YFTZkxx13yRtOQfQ2rhCHE702fLox+8QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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