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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e6ee6f3769cfb74fedee4780ecae4598bdfd2aeb7e1011e194d08987854b1c' 
  AND token = 'C0ALbSQWio1JPU5z6+Xu21VM92hhgSJPKBmEnBENz3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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