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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739ac168d539d94592a8ed539b9114648b8750068cf312021b0b7f056d7e5ccf' 
  AND token = 'ZVAlW0YAToMyWNQQtYEcOXBIXkzqe9uvxlWS8HqStr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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