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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6666898c1446e319cae87f2812da3e74c95325f34a947cf06e7c47264a724036' 
  AND token = '6QaHS5d1bvXtL0TURtGXao2GWmS8tvvnGYhAz5lNMUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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