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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5312ff3096a87b96ee999ec1b28d412068668dce5a3f82a6774958ad526a9152' 
  AND token = 'afCaCZeNmEVbS7FuoDNqL6fKIgf+FZuNysNLY1mZr/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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