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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8031d37f18e3db3869b409aaebdf8dcf4d8e507a98fc8b28d60b9fe00c2271d3' 
  AND token = 'sgDwsGed3lUA4YLCeUPhpZEOb9/DzrJBRDpy84qnRFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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