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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14d8f4990511304fe347edde9434364c8a501763fc8ee7218226121fad39e1f0' 
  AND token = 'pSydGHDK33sDu9GcNqIcYiQjzVF7wy0d8yM+zhAmHmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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