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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49fd71c1d3da627c652ee778e76da62dc5cb068c73088134491b07ed10fd6c8e' 
  AND token = 'onb+PcXBjT9rSBOAPYapp8OErfwnnZZyo5A2DzmcyKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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