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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3bedc45ade3200f9b1531f8ff78140a2016e772f029f14d37bb2d5255132041' 
  AND token = 'LhAad0Ps6QgXbcjyIzzK5AGycXF4X5MAa+aQGvBl6Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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