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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856f90d9b54dbea29bd75c590c428e3caf877d528effb30a6a4d6e3c806bc2d0' 
  AND token = '9s+NMoRGZqz7ElRSLCo1eMMlbeklBRsYCDhv0/djkVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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