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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9390026ab8d8f53c7204df388e32d10a7778d9b2f88d801b9ea1e54af1bc4388' 
  AND token = 'sSRUw6RcRoH4W+4Kduc4EeSC10zD+l7xkLKZRwQBUok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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