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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d11b59dceec0e850ca595e194d0a0e4739b3a7e1d97f8c3163c60918205d8e4' 
  AND token = 'wi0Jk44C/PcFo8SkXOsfeduM5CSV7nhSwnlvv9U6IcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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