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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556dbb39f6e4ef442c1abb54d6db5425739c399e5f69e819e6c818b79772e630' 
  AND token = '9sAxeUZoRspcstilRX1BxignQQ2zVFtuVfjoCE/81jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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