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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77298103fdb0ef0805d3752f6e00a9683c1c3bae548519ae4b1e9991ea57665a' 
  AND token = 'mtCJRjwk9DrfENq1dQMSL2TEM/t3HTUUXHDOZAO+ETU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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