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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f8ce57ae1407ba183aeb566ca81a55f4f8ea63fea5c82bd4030abe9f8dffe1' 
  AND token = 'H32/l4taom2ish47/d8Ea/LGyGsXvywlHQOiSzB8ikg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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