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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20ae76174fdd2f044a74912f3b606d4f2705bcc5ad3237367f0aff3aa6d63be' 
  AND token = 'ycjtKnH3XtlWWSFjPmf16mFpbxaTtkB/NKW40P6+QM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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