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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fcc4e02576fea704d7bebe6b5b82da40b182a2f597f89472fbd1106c90e6135' 
  AND token = 'nfIvmBvaXkg5JxL5lnzLnQvb7bkzycm4PbHy9NZN53M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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