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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb334f3776e278cf9a00a5bc1c91cdc68f09600bb4ce1efb9aeff52e7dfc701' 
  AND token = 'Td8F4w7inag/hlIztvgazUJzsg976JknYN3J7/66/uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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