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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062f1d3de6b7ce68ec84e855f4bcf42c09f63b46e6309070b53bf5aeedbd6773' 
  AND token = 'x64nLasiYw07Q/KaUm4vel8BbmKbwNvR7LmnC5USMFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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