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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8f6d4041317c2aabdc9c9508e1850e7c208bcacde4404be09d4b3abf725b83' 
  AND token = 'W7wqdW6A1kmHYrklVWIGy7d0qXhjxQYW4Di7zc/jp88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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