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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4dd72d8dff815440edc270d9c309beb6dcc19052d2279ec4895185022b5a703' 
  AND token = 'V3fG5kqGmGslFT58DUVXzESjsL8bPSIeR0qDeHTGv0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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