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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15ae3a32e27f075bba27f4090606c92151f703d3b076b7f2d91e038b2d426bed' 
  AND token = 'SmFQH3K4H/8gMEvtGzVDJ5eT3v1OaRRa7KEVQLzQYGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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