SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7efa85b85f8161c3e8972cfe57021d69d3453b7c506e91c39325bef239bea9' 
  AND token = 'yyh/baNM+QHrBOz4hoMRp7xGvEVPQ0CYltTpZ3fKZgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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