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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32817f7c22449df146b03b67d78cb2e2ca2747799609392f1903d652495747e3' 
  AND token = '5g1IWBItZLZpxv75nHpFQMby8EtT/3M+pxcLaH7XqI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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