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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79ac323762f7dc98860fe10995e52bb59f05e04443d2b425af582d2a2320d02' 
  AND token = '7LgVwen6IrJJCbaA/ED8UmArasliKXl8qiNDSP9hWFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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