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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ed09b82ec878c04361f609f71f54b83f00811ef8b9878cbe07f3533eadc5e0' 
  AND token = '5BdpSDR+WJYa3DatWS0b4ZfA+gNvsR8qFJxHTUMLj84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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