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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf166fddd2bee8b4900d977fb4674d15e097167a2b741644e34ebbb3bcc68f6' 
  AND token = 'JB/xEJHbkwpqbOsrw2PWujuZ/xqFSHfF8Q6tCjzSndA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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