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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8bc86ab285e2532b5b5d90aa0302d7b3e28f64afd06c7108f8a4a04d4ff8d96' 
  AND token = 'S7VdsWVsu5kRD//c0dwidnQoxtNDFgG3vMd1kxXdX3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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