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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e336c3e1269a738aa36daabaf0d0258fcde1392f90bd0463790f39b65e498d' 
  AND token = 'Moac8tIxPhTBuli3C7OBh/bDB+xaOix6+cwibLIxPV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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