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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8e8d13d988524468e3b55e6177b9b8dcb6dd8aa84988c25d8ab2af05fbb093' 
  AND token = 'aUjMxe6ut7oMQPTxObKQKcQgqD4iFMwrnO8T+8RY7Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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