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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13be86ab7ee7a3de594047d075ba96ba5d53d1cd8bdad1b8187875db762c2ec' 
  AND token = '1jLcNW+t+tmt1I+l6QPgBojwtOYt38IJSZ3KWTvibpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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