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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a731f8e572bf16aec833118a214e1e19b88d4daac3bc034695f1bef851df76c3' 
  AND token = 'rgCAfgw9DS5jjbe934l4t/nnQXIIMp7ncdjd5aO79LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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