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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96a84b14ab4ca991401dade193eba6505d7423d45d72e504f5652b697862ee5' 
  AND token = 'IZG8bINtJBh15DzJPX9UfTQ4CUP3+gr/LwdoM+m8IrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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