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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febd20d29a930e182fc21b120a67c39c91bcb966a153c618fa7d80a10419be93' 
  AND token = 'DkJWR3HRAUWC+cO7vFzgUsdB2pLTYNX43bcxmgmvMrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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