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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0be3360e9ff89911a8c7c8f387ca2a6e6c55ff48047e4d44a60b9aa1e03b4a1' 
  AND token = '5LnGR3X3swdhHAHf2xko7oQZFjwJDjUF8RggkQp6uAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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