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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5cc62e2dc07ae0d1119006c3ea80a1c9b3f88daac9d105580318adc3cde09cc' 
  AND token = 'otZGpeVyFVYQ4IHbW7RExsA//+5CFLV81YQNkMM6s6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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