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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eace06eed134e404531bc05bb6010a59993e416144299a13038ab2c17376869' 
  AND token = 'Hpt7iOUOOzUs8ZyftT2GanFg6C96sc0fBOSdHVaoluI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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