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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ae1d96c5738bf81ee72e9a54595e3eafcde6a5de4a763690db0000cf01d539' 
  AND token = 'H8BJJxor6ywR9eaWuxtzzuvYuRpy+ELg0LmYJNwlZps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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