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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf211b3321945889ad8422dfc1c5cc1dadacb60964575c67d918a672f672fc27' 
  AND token = 'X0YwYctfKlIyV4t2kXY3heCwjKOOOO4XI/LI3vE087M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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