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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5f330df21c111e7d2cb52de0da0addf9df83c47a50826ec3af068819d943f4b' 
  AND token = 'ri3w4nmkRJ8kbGQqQ2xyGq07Ws9adVNmMvut6qHbMNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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