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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce78327afa20b79e7156c7929e657caff6244ffa029f2355f06e45075f0c2c4c' 
  AND token = '0Ip1yPYmBkMAIIs7YYnjc+aiFH0NQd3xQV08bAqYbxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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