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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ccf0c05435e059641f63db0f8a4423e00d1b705502b115015e0e263f71113c' 
  AND token = '368eNAXMZHsqLTmlmm5kWqbRUTnHVuF/NRGzz0gVY9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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