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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ed790013b8e475ab8154569d11e0ddd767820fd0c28cc172b9e424f31cd97b' 
  AND token = 'kbxdrzIaG7KRdB4eY6qA09NJtoC3bexbHDK2McyF3og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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