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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97eea183452a8d6e5ff2341c059660038545c43616533e2536d1630d022f07c5' 
  AND token = '6vKaPUScqms0eYNtBGX/e2pVoYLxjscLrGhac4MkTmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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