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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141d43f0ef3d59683ebe8268d624e3a5499a5f18169621510956fde11b278423' 
  AND token = 'e/TYPSEpUT+jDRvWurga324B6BmYMrXDrR2LK5td6jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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