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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e956a045c178513e953a8e2dbef140ca0873df149a8ca5f77052c41828454a' 
  AND token = 'SKbpbMthQWUT00ecMwhHuk3a9dxqsCx4IvIuHT0sNc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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