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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704e5a7c10a369aa19ba8f4adada57456276c938480d20a86f050e1be181f144' 
  AND token = 'FLWWiYmPx26UUC8mcxIWxaa/loz4mDYp69EGq45JNIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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