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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62efca95279d2928f8e8260c8c6e6fe512b9e68f13aec21f1aee278f4e1daee7' 
  AND token = 'P9ytFBDR8qRVKsLesdCmY16BiBpe94Ba/2nSxnEPbZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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