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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2367d0741672a4b6956f970b952ec5403241949661c87f9ab98599b040df71aa' 
  AND token = 'Ih6yXV9UqbVY0sa3H1pqPx98dhb6hoCpj7JhTMdJmT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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