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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ebedffa06ea483b3f8f9488c24fa9efbf321ce66356d5a2a0aad64b3485f1b' 
  AND token = 'mWT0MYw7aQjvYRKwBks2uinXQOo9vVJo1MJTYWpzAsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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