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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39dc5477ac8f20d3e3b21b129730f86a4c7704c158bbc798a897167d69d931e' 
  AND token = 'dmmBxWCN4pS3YEBAaL1sHT/1KlX8E8dkC8hzGS1aRV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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