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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05cc2312546d36616b14abc810133aa0419ae8546b6207b21572c643607381e4' 
  AND token = 'LIKg3P27hsApjU943QxWvlWuItJoaqG3mN7fKvqX7zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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