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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8df2f5571ba32b072e3a010e1a2d34b19b6c812316b57a71c12fe523af542b2c' 
  AND token = 'b+7BmI3DBVnapZ8DEWPcvd21wx+ueJBq5w9i1ToGpSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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