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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dfee73e4e1684896bdb54b4e07bfe6a8b2a0e792299c53887986b6bfcef2be' 
  AND token = 'QTypjqFZEYmPQpqKHVIA6bG6cMImKV/UmqAnq1P9RGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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