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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25b929baa551788d2cc43cae6b9789c8129a3b182eff28ef0a7e7a6bd3f1953' 
  AND token = '85xFAho283lCJxmH6TRjmRLUMB21URzaVY4tlpDbe/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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