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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d725f7df65358f61ce808bd1a6a1e214408411804a9f1391edb4e505990d0bc' 
  AND token = 'A5q6/jIYpajsNihVsRUHIzhfNIQc26YnCIMUAnJQ4pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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