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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34de93f933afc379b1d7ff56393e2739209467c6e6d674aab9e5beae8f3a4290' 
  AND token = 'syjBUo0/68GICx6BAotOqa9Zt2b63JxuE5AgYLNXN1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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