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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314a80f91d6f7f55ad9dc0c8a9eea6b9673753833d52a6c55c30c68230ef22f2' 
  AND token = 'aYf5UEHRE7pUDjdUBU7fP8/F+tEPDSB5+uhLu75cYYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00298

JSON explain

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